Evaldas worked on the elsa-core repository, implementing CorrelationId support for the NewBookmarkQueueItem model to enable end-to-end correlation across the Elsa workflow runtime. By propagating the CorrelationId through components such as StimulusSender and BookmarkFilter, he improved observability and traceability for correlated workflows, which enhances debugging and analytics capabilities. The update included clarifying documentation to indicate that the CorrelationId is optional and only present when available, ensuring backward compatibility. His work focused on backend development and workflow orchestration using C#, with careful attention to code documentation and non-breaking changes, demonstrating a thoughtful and targeted engineering approach within a short timeframe.